K&N Drop in Filter-sound increase?

Sp82 · 01-04-2010, 10:20 AM

I've searched the forum for the last hr, but cant seem to find a concrete answer...

I'm thinking about replacing my OEM filter with the K & N drop in.

Any gains?..and advantages vs. OEM?..

and most importantly..is there ANY sound difference?..deeper roar on acceleration?...louder idle sound..anything?... any and all input is appreciated!

clark192 · 01-04-2010, 10:36 AM

I don't have the 335, I have the 325i, but I can say that even with my NA engine, the filter definitely boosted the sound. It sounds really nice at 5k + RPMs. The power is modest for NA, maybe a couple more in the upper range, but nothing terribly noticeable.

I would imagine for a 335 you would see more gains than I. Sound is nice. Not very loud, but its just nice for me.

Darkcyd_Turbo · 01-04-2010, 10:39 AM

i have a drop in and to be honest i don't notice sh!t when it comes to sound...as for hp gains, anything is better flowing than the oem paper air filter. if you really want sound, i would recommend a dci. BMS has theirs for a little over a hundo new or you can find a used one in the classifieds. best of luck with your search for an intake...

D.B.S · 01-04-2010, 11:10 AM

I have the K&N drop in filter, and I don't hear any difference in sound... It's neither louder nor softer... If you want a change in sound, get a DCI/CAI, because a drop in filter isn't going to change the sound...

bimdaddy · 01-04-2010, 11:36 AM

No extra sound except a very slight turbo spooling/whistling sound. Not loud like a DCI though.

MSimeon · 01-04-2010, 11:38 AM

ive got it and to be perfectly honest, i dont notice a difference in sound or performance. but it's nice to know that it flows better than stock. if that makes sense.

reno808 · 01-04-2010, 11:46 AM

I do not have K&N but i do have performance drop filter. I do hear a difference on full acceleration and their is a very small gain that u feel down low.

NRG · 01-04-2010, 12:36 PM

I had numerous drop-ins. The best one was the BMS (S&B) one, that provided slightest sound difference in higher RPM with a little sharper throttle. Others... no difference noted over stock.

Syndicategt · 01-04-2010, 02:56 PM

I have both a DCI and BMS drop-in. The DCI has a great sound and with a tune, it's very audible. I notice no sound change vs stock with the drop-in, with or without a tune. I run the DCI in the winter and in the summer I use the drop in because of heat soaking.

NiVeDh · 01-04-2010, 04:20 PM

I have a BMC drop-in filter and there is no noticeable sound increase. However, the engine revs more freely.

01-04-2010, 10:20 AM	#1
Sp82 Colonel 166 Rep 2,000 Posts Drives: F15 X5/G30 5er Join Date: Feb 2006 Location: DFW, Tx iTrader: (1)	K&N Drop in Filter-sound increase? I've searched the forum for the last hr, but cant seem to find a concrete answer... I'm thinking about replacing my OEM filter with the K & N drop in. Any gains?..and advantages vs. OEM?.. and most importantly..is there ANY sound difference?..deeper roar on acceleration?...louder idle sound..anything?... any and all input is appreciated!
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01-04-2010, 10:36 AM	#2
clark192 Second Lieutenant 17 Rep 230 Posts Drives: 2006 325i (EU) Join Date: Aug 2007 Location: Bahrain iTrader: (0)	I don't have the 335, I have the 325i, but I can say that even with my NA engine, the filter definitely boosted the sound. It sounds really nice at 5k + RPMs. The power is modest for NA, maybe a couple more in the upper range, but nothing terribly noticeable. I would imagine for a 335 you would see more gains than I. Sound is nice. Not very loud, but its just nice for me.
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01-04-2010, 10:39 AM	#3
Darkcyd_Turbo "Booty Hole Bandit" 32 Rep 1,597 Posts Drives: 2008 Montego E92 335xi Join Date: Apr 2009 Location: Madison, WI iTrader: (14)	i have a drop in and to be honest i don't notice sh!t when it comes to sound...as for hp gains, anything is better flowing than the oem paper air filter. if you really want sound, i would recommend a dci. BMS has theirs for a little over a hundo new or you can find a used one in the classifieds. best of luck with your search for an intake...
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01-04-2010, 11:10 AM	#4
D.B.S Lieutenant Colonel 30 Rep 1,748 Posts Drives: '11 X5 35i / '13 S5 Join Date: Jun 2009 Location: Deployed to Kuwait iTrader: (2)	I have the K&N drop in filter, and I don't hear any difference in sound... It's neither louder nor softer... If you want a change in sound, get a DCI/CAI, because a drop in filter isn't going to change the sound... __________________ BMW X5 35i: Boopie Exhaust & Intercooler, K&N Drop in Filter, JB3 (3+ psi) 2013 Dodge Challenger R/T: CAI, Catch Can, Custom Exhaust, Headers, 87MM Throttle Body, Diablo Custom 93 OCT Tune
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01-04-2010, 11:36 AM	#5
bimdaddy Major 37 Rep 1,165 Posts Drives: 911 Carrera & G01 X3 Join Date: Feb 2007 Location: MD iTrader: (10)	No extra sound except a very slight turbo spooling/whistling sound. Not loud like a DCI though. __________________ 2020 X3 X-Drive 30i; Alpine White/Mocha
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01-04-2010, 11:38 AM	#6
MSimeon First Lieutenant 29 Rep 372 Posts Drives: E92 335I BSM Join Date: Feb 2007 Location: San Bruno CA iTrader: (1)	ive got it and to be perfectly honest, i dont notice a difference in sound or performance. but it's nice to know that it flows better than stock. if that makes sense. __________________ Ordered 4-25-07 Delivered 7-20-07 E92 335i black sapphire metallic, sport, premium, and Navi. JB4, K&N Drop in, Matte Black Window Trim. Linea Corse Dyna 19x8.5F 19x10R Previous Ride: 2004 Silverstone 350Z enthusiast. APS TT Built Motor at 12PSI. 467rwhp and 413 rwtq. Tuned at ZCARGARAGE. (Missed, but never forgotten)
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01-04-2010, 11:46 AM	#7
reno808 Banned 10 Rep 345 Posts Drives: Fiat Panda Join Date: Mar 2009 Location: C&C Motorsports Garage iTrader: (2)	I do not have K&N but i do have performance drop filter. I do hear a difference on full acceleration and their is a very small gain that u feel down low.
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01-04-2010, 12:36 PM	#8
NRG Lieutenant Colonel 36 Rep 1,658 Posts Drives: 2012 X5 35d Join Date: Mar 2007 Location: Montreal QC iTrader: (5)	I had numerous drop-ins. The best one was the BMS (S&B) one, that provided slightest sound difference in higher RPM with a little sharper throttle. Others... no difference noted over stock. __________________ Retired: 2005 N52 E90 330i Sport 6AT Retired: 2007 N54 E92 335i Sport 6AT Current: 2012 M57 E70 X5 xDrive35D
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01-04-2010, 02:56 PM	#9
Syndicategt Brigadier General 153 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	I have both a DCI and BMS drop-in. The DCI has a great sound and with a tune, it's very audible. I notice no sound change vs stock with the drop-in, with or without a tune. I run the DCI in the winter and in the summer I use the drop in because of heat soaking. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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01-04-2010, 04:20 PM	#10
NiVeDh Major General 422 Rep 8,003 Posts Drives: '08 E90 335i, '99 E36 M3 Join Date: Apr 2009 Location: Houston, TX & Atlanta, GA iTrader: (132) Garage List 2008 BMW 335i Sedan [8.66]	I have a BMC drop-in filter and there is no noticeable sound increase. However, the engine revs more freely.
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